In a clean s-wave superconductor, finite-momentum particle-hole asymmetric coupling moves spectral weight between Higgs and Bardasis-Schrieffer modes but cannot make their dispersions cross.
Single pairing channelIn this section, we will de- rive the expression for the susceptibility of the amplitude Schmid-Higgs (SH) mode for the cleansord-wave super- conductor
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Finite-momentum coupling of Higgs and Bardasis--Schrieffer modes in superconductors with competing pairing channels
In a clean s-wave superconductor, finite-momentum particle-hole asymmetric coupling moves spectral weight between Higgs and Bardasis-Schrieffer modes but cannot make their dispersions cross.